Particle size reduction currently receives rapidly growing attention from all industry sectors since it allows to derive interesting material properties from simple and proven chemical compositions. Wet precipitations are well-known and thus attractive synthetic reactions but classical reactor concepts are often unsuitable for nanoparticle precipitation because of slow reactant mixing. Instead, highly elaborated ways of crystal growth and aggregation control are demanded. Until now, only few precipitation reactions could be transferred from laboratory to production plant, and all of them require considerable engineering efforts. According to a novel precipitation technology, finely dispersed solid particles having sizes down to the nano-scale can now be industrially manufactured. Two reactants are separated in different compartments of a largely unpressurised membrane reactor while mass transport takes place by diffusion of one reactant through the membrane pores. The method is universally applicable, i.e. not confined to a specific reaction, and different kinds of industrial membrane modules can be used. Through specific selection of the membrane composition the process can be implemented under continuous operation without detrimental plugging. Additionally, sample preparations of CaCO3 nanocrystals thus obtained exhibit large porosities which suggest novel applications as absorptive or carrier materials.
Medium to large-scale preparation of (primarily inorganic) micro- and nanocrystalline powders.
Stage of Development
German priority patent
Joint development with out-licencing option.
Our reference: UKL062
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